An occur buffer is just a buffer in read-only mode, that doesn't mean that it cannot be manipulated.

Something as straightforward like this can help you:

``` lisp
(defun occur-kill-line()
  "Quick and dirty discard line from occur resultset.
from https://emacs.stackexchange.com/a/52865/13589"
  (interactive)
  (let ((inhibit-read-only t))
    (kill-whole-line)
    (delete-blank-lines)))
```

invoking this function will kill the current line in occur buffer. Pressing `g` will revert the buffer. 

Adding this:

``` lisp
(define-key occur-mode-map (kbd "k") 'occur-kill-line)
```

will bind `k` to `occur-kill-line` to `occur-mode-map` making it available as occur command just pressing `k`.